Question:
How many keys are used in common legacy Triple DES algorithm of cryptography?
How many keys are used in common legacy Triple DES algorithm of cryptography?
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DES uses 1 key.
Triple DES typically uses 3 independent keys.
Updated On: Jun 25, 2026
- One
- Two
- Three
- Four
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The Correct Option is C
Solution and Explanation
Concept:
Triple DES (3DES) was developed to increase the security of DES.
It applies the DES algorithm three times.
Step 1: Working of Triple DES.
Encryption is performed as: \[ C=E_{K_3}(D_{K_2}(E_{K_1}(P))) \] where \[ K_1,\;K_2,\;K_3 \] are encryption keys.
Step 2: Number of keys used.
The common form of Triple DES uses: \[ 3 \] different keys.
Step 3: Select the answer.
Hence, \[ \boxed{3} \] keys are used.
Step 1: Working of Triple DES.
Encryption is performed as: \[ C=E_{K_3}(D_{K_2}(E_{K_1}(P))) \] where \[ K_1,\;K_2,\;K_3 \] are encryption keys.
Step 2: Number of keys used.
The common form of Triple DES uses: \[ 3 \] different keys.
Step 3: Select the answer.
Hence, \[ \boxed{3} \] keys are used.
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